Portable sink



FIG. 1 is an isometric view taken from the top, front and left side of aportable sink showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a bottom plan view thereof.

The ornamental design for a portable sink, as shown.